PCMGSetInterpolate

Sets the function to be used to calculate the interpolation on the lth level.

#include "petscksp.h" 
#include "petscmg.h"   
PetscErrorCode PETSCKSP_DLLEXPORT PCMGSetInterpolate(PC pc,PetscInt l,Mat mat)

Collective on PC and Mat

	pc	- the multigrid context
	mat	- the interpolation operator
	l	- the level (0 is coarsest) to supply

Usually this is the same matrix used also to set the restriction for the same level.

One can pass in the interpolation matrix or its transpose; PETSc figures out from the matrix size which one it is.

If you do not set this, the transpose of the Mat set with PCMGSetRestriction() is used.

multigrid, set, interpolate, level